I don't know anything about the FN, but know guys that shoot the Remingtons and love them. I shoot Benelli's and am a believer. My first was an M2 for hunting, and when looking for a tactical I tried an M4. I ended up with an M1 with 20" barrel, and I added large bolt handle, large bolt release ($15 or $20 each from many suppliers) and a mag extension for $100 (now holds 8+1). It still has vent rib, but I am thinking of adding a red dot. I could add the pistol grip stock, but am more comfortable with the regular stock. Might spend the money for the pistol grip anyway, because I fear within a year someone will be telling me I can't anymore.
Bottom line for a competition or defense gun is that it needs to go bang every time, and Benellis do! They are advertised right down to the guy that jammed in dusty Nebraska and poured his coffee thermos in to rinse it clean. I've been warned that they will give trouble in freezing fog or drizzle during waterfowl - mine hasn't in four seasons, and if it does ... my friends gas guns do too.